Keep your SimplBooks workflow exactly as it is. payinbtc.me adds a Bitcoin payment option to the invoices you already send, connected to any of 14 Bitcoin wallets and payment providers, with the money settling to an account you control.
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Not on its own. SimplBooks is built around invoicing, e-invoicing and Estonian bookkeeping: sales and purchase invoices, automatic bank feeds from Swedbank, SEB, Coop and LHV, VAT returns filed straight to the Estonian Tax and Customs Board. What it does not include is a payment button on the invoice itself. Your customer receives an invoice and pays it by bank transfer, and Bitcoin is not one of the options anywhere in that flow. That is the gap payinbtc.me closes, and it is a pairing we run ourselves: BTC2B Group OÜ, the Estonian company behind payinbtc.me, keeps its own books in SimplBooks and collects Bitcoin through payinbtc.me into Lightning Checkout, a fellow Estonian provider.
payinbtc.me works as an integration layer between SimplBooks and the Bitcoin payment provider you choose. You connect both accounts once. The connection to SimplBooks is read-only: we read invoice amounts, currency and invoice numbers so we can build the correct payment, and we cannot write to or change anything in your books. From then on, the invoices you send carry a Bitcoin payment option next to bank transfer. Customers who want to pay in Bitcoin can. Everyone else pays exactly as before.
When a customer opens the Bitcoin payment link, we pull the invoice amount and currency from SimplBooks and convert it to BTC at that moment's exchange rate, then show a payment page with a QR code. They pay from any Bitcoin wallet, over the Lightning Network for near-instant settlement or on-chain for larger amounts. The Bitcoin lands directly in your wallet or provider account. We never hold your funds, and there is no percentage of the invoice taken anywhere in the flow.
This matters most for the audience SimplBooks has grown up with. Estonia's e-Residency programme has put company formation in reach of people who run an Estonian OÜ without living in Estonia, and SimplBooks is a common choice for keeping those books. Those owners are freelancers, consultants and small software companies who invoice clients across borders and rarely in a single currency. A client in the US or Asia paying a euro invoice by international transfer costs wire fees and days of waiting, and a card gateway would take a percentage on top. A Bitcoin payment does not care where either party sits: it settles in seconds, on a Sunday, for a fee measured in cents. This is the exact reason we added it to our own SimplBooks setup.
Nothing about your SimplBooks workflow changes. You create invoices the same way, your bank feeds and VAT returns stay the same, and reconciliation works the way you choose to record it. Today you mark the invoice paid after the payment notification arrives: we email you the moment the Bitcoin clears. Automatic reconciliation, marking the SimplBooks invoice paid for you, is on our roadmap for later in 2026 and not something we claim today.
All 14 providers work with SimplBooks. But SimplBooks users are concentrated in Estonia, Finland and Lithuania, and many run a location-independent OÜ invoicing clients abroad, so these four are where most SimplBooks users should start, including the Estonian provider we use in-house:
Full self-custody for an OÜ owner who wants no third party in the money flow
The Estonian Lightning provider we run our own books against
Baltic and EU businesses that want a euro settlement option
OÜ owners invoicing US and international clients
Not sure? Start with our hosted BTCPay option. It is the only choice that requires no third-party account at all, it keeps your Bitcoin in your own custody, and you can switch providers later without touching your SimplBooks connection.
Estimated time: 5 minutes
More questions? See our full FAQ →
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